Jar cap



FIG. 1 is a perspective view of a jar cap showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view, the right side view, and the side view being the same;

FIG. 3 is a top plan view thereof;

FIG. 4 is a perspective view of a jar cap showing a second embodiment of new design;

FIG. 5 is a front elevational view of FIG. 4, the rear elevational view, the right side view, and the left side view being the same; and,

FIG. 6 is a top plan view of FIG. 4.

The bottom and interior of the bottle cap form no part of the claimed design. 

The ornamental design for a jar cap, as shown and described. 